JP5528738B2 - Image forming apparatus and image forming method - Google Patents

Description

  The present invention relates to an image forming apparatus and an image forming method, and relates to an improvement in an image forming apparatus and an image forming method such as a printer, a copying machine, a facsimile machine, or a multifunction peripheral (MFP) equipped with these functions.

  In this type of image forming apparatus, a latent image is formed on the surface of the rotating photoconductor based on the image data, a toner image is formed from the latent image by the toner supplied from the toner cassette, and the rotating photoconductor and the pressure are applied thereto. A configuration is well known in which a toner image is transferred onto a sheet by conveying the sheet between the pressure rollers arranged in this manner, and the transferred toner is heated and fixed by a fixing unit and discharged.

  Since the pressure roller is arranged to press the rotating photosensitive member on which the toner image is formed, the rotating photosensitive member is not in a state where the sheet to be conveyed is positioned between the rotating photosensitive member and the pressing roller. There is also a possibility that an unnecessary toner image is transferred to the pressure roller, and then the toner is transferred from the pressure roller to the back surface of the paper conveyed between the rotating photosensitive member and the pressure roller, and the paper is soiled. I am worried.

  For this reason, it is necessary to provide a mechanism for cleaning the surface of the pressure roller, or to devise a technique in which an unnecessary toner image is not transferred from the rotating photosensitive member to the pressure roller.

  For example, the cleaning method disclosed in Japanese Patent Application Laid-Open No. 2007-178493 (Patent Document 1) is also this type.

  This patent document 1 discloses a first image carrying unit capable of carrying a first image formed by a first image forming unit on a first image carrying belt, and a second image formed by a second image forming unit. A second image carrying unit capable of carrying the image on the second image carrying belt, and a transfer for transferring the first image and the second image carried by the first and second image carrying units onto both sides of the recording medium. And a recording medium conveying path including conveying means for supplying and conveying the recording medium between the first and second image forming units, and from the first and second image bearing belts to both sides of the recording medium simultaneously. The image forming apparatus for pressure transfer is characterized by a method of controlling the cleaning means for cleaning the first and second image bearing belts according to the image information, and enables high-quality double-sided printing without image omission. Than is.

JP 2007-178493 A

  However, in the above-mentioned Patent Document 1, high-quality double-sided printing without image omission is possible on a recording medium as printing paper, but the toner is easily transferred directly from the rotary photoconductor to the pressure roller. There is no change.

  Therefore, as a result of careful observation and examination of the configuration and usage of the image forming apparatus, the present inventor changed the way of thinking, and transferred the toner image from the rotating photoconductor to the pressure roller to actively copy the information on the back side of the paper. The present invention has been completed by paying attention to the fact that it is possible to achieve this.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus and an image forming method capable of actively displaying information on the back surface of a sheet without reversing and conveying the sheet. With the goal.

In order to solve such a problem, an image forming apparatus according to claim 1 of the present invention forms a main toner image based on main image data on a rotating photosensitive member and the rotating photosensitive member, and uses the apparatus. A toner image forming unit for forming an auxiliary toner image based on auxiliary image data for specifying a person, and a diameter that is significantly shorter than the diameter of the rotating photoconductor, and pressurizing the rotating photoconductor. A pressure roller for transferring the main toner image to one side of the sheet conveyed between them and a transfer of the auxiliary toner image to the opposite side of the sheet, and a predetermined roller for each sheet for transferring the main toner image on one side A sheet conveyance control unit for controlling the conveyance of the sheet between the rotating photosensitive member and the pressure roller at intervals of the interval, and forming a main toner image on the rotating photosensitive member for each page, and at the last page of the main image data Controlling a toner image forming unit to form a toner image forming position and the auxiliary toner image on the rotating photosensitive member front portion of slightly less dimension than the circumferential dimension of the pressure roller, the last page of the main image data, the Prior to the main toner image, the auxiliary toner image is directly transferred to the pressure roller, and the main toner image from the rotating photoconductor and the auxiliary toner image from the pressure roller are transferred to the front and back surfaces of the paper at once. And a print control unit that controls the sheet conveyance control unit to convey the sheet.

  The image forming apparatus according to a second aspect of the present invention has a configuration in which the print control unit controls the toner image forming unit to form a single color auxiliary toner image based on the auxiliary image data.

  An image forming apparatus according to a third aspect of the present invention is configured such that the pressure roller has a cleaning unit for removing traces of the auxiliary toner image transferred to the paper.

According to a fourth aspect of the present invention, there is provided a main toner image forming process for forming a main toner image on a rotating photoconductor based on main image data for each page, and a main toner image on the last page of the main image data. An auxiliary toner image forming process for forming an auxiliary toner image based on auxiliary image data for identifying the user of the apparatus on the rotating photoconductor in a front part slightly shorter than the circumferential dimension of the pressure roller from the formation position; with respect to the rotation photoreceptor pressurizing so arranged that the pressure roller to the rotating photoreceptor has a significantly shorter diameter than the diameter of an auxiliary toner image transfer process for transferring the auxiliary toner image directly prior to the main toner image The main toner image is transferred to one side of the paper conveyed between the rotary photoconductor and the pressure roller for single-sided printing from the rotary photoconductor, and at the last page of the main image data, And it includes a paper transfer process for transferring the auxiliary toner image from the primary toner image and the pressure roller from the photosensitive member at a time to the front and back surfaces of the paper, the.

  The image forming method according to claim 5 of the present invention has a configuration in which the auxiliary toner image forming process forms a single color auxiliary toner image based on the auxiliary image data.

  According to a sixth aspect of the present invention, the pressure forming roller includes a cleaning process for removing traces of the auxiliary toner image transferred to the paper in the pressure roller.

  In the image forming apparatus and the image forming method according to the first and fourth aspects of the present invention, the main toner image is formed on the rotating photoconductor based on the image data for each page, and the main toner image forming position for one page is formed. An auxiliary toner image based on the auxiliary image data is formed on the rotating photoconductor a little earlier, and the auxiliary toner image is directly transferred to a pressure roller arranged to apply pressure to the rotating photoconductor, and the rotating photoconductor When the main toner image is transferred from the rotating photoconductor to one side of the paper conveyed between the pressure roller and the pressure roller, the auxiliary toner image is transferred from the pressure roller to the opposite surface of the paper at a time, so the paper is reversed and conveyed. Therefore, the toner image based on the auxiliary image data can be displayed as information on the back side of the paper.

  In the image forming apparatus and the image forming method according to the first and fourth aspects of the present invention, the auxiliary toner image forming process forms an auxiliary toner image before the last page of the main image data. Whether it is minutes or multiple sheets, it is easy to check information on the back side of the paper.

  In the image forming apparatus and the image forming method according to the first and fourth aspects of the present invention, the auxiliary toner image forming process forms an auxiliary toner image based on auxiliary image data that identifies the user of the apparatus, and thus is particularly used. It is easy to identify a person.

  In the image forming apparatus and the image forming method according to the second and fifth aspects of the present invention, the auxiliary toner image forming process forms a single color auxiliary toner image based on the auxiliary image data. It can also be easily implemented in image formation.

  In the image forming apparatus and the image forming method according to the third and sixth aspects of the present invention, the pressure roller has a cleaning process for removing traces of the auxiliary toner image transferred to the sheet. It is difficult to transfer the same auxiliary toner image based on data across a plurality of sheets.

1 is a schematic block diagram showing an outline of an image forming apparatus according to the present invention. 1 is a schematic configuration diagram illustrating an internal configuration of an image forming apparatus according to the present invention. FIG. 6 is a diagram illustrating a toner image forming operation in the image forming apparatus according to the present invention. It is a figure explaining operation | movement of the image forming apparatus which concerns on this invention.

  Embodiments of an image forming apparatus and an image forming method according to the present invention will be described below with reference to the drawings. The image forming apparatus method according to the present invention will be described in the course of describing the image forming apparatus according to the present invention.

  First, a general configuration of the image forming apparatus A will be briefly described.

  1 and 2 are a schematic block diagram and a schematic configuration diagram showing a configuration of an image forming apparatus A according to the present invention.

  In FIG. 1, the image forming apparatus A includes an image reading unit 3, a storage unit 5, an operation panel unit 7, a printing unit 9, and a communication unit 11 connected to the main control unit 1. For example, a multifunction device. The image forming apparatus A has other constituent elements than these, but is not a main part of the present invention, and thus description and illustration thereof are omitted. The function of the main control unit 1 will be described later.

  The image reading unit 3 is a known scanner that optically reads an image from a document under the control of the main control unit 1 and generates electronic image data subjected to filter processing or the like as a print job. The pages are sequentially stored in the storage unit 5. As shown in FIG. 2, the image reading unit 3 is disposed on the upper part of the main body case 13.

  The storage unit 5 is under the control of the main control unit 1, a print job from the image reading unit 3 or the communication unit 11, an operation application program of the main control unit 1, operation screen information for operating the image forming apparatus A, which will be described later For example, it is a readable / writable hard disk (HDD) that stores employee numbers and the like.

  As shown in FIG. 2, the operation panel unit 7 is an input / output unit that also serves as, for example, a known liquid crystal display and a touch switch arranged on the top of the main body case 13, and forms an image under the control of the main control unit 1. In addition to displaying the operating state and various data in the device A, it has a function of receiving an operation instruction of the device A and an input of an employee number (auxiliary image data) for identifying a user at the time of activation.

  The printing unit 9 is a known printing that inputs image data from the storage unit 5 and develops it into image image data under the control of the main control unit 1 and forms an image by, for example, monochrome printing on a sheet-like paper (medium). An engine, which constitutes the main part of the present invention, will be described in detail later.

  The communication unit 11 is connected to an external electronic device such as an image forming apparatus (both not shown) via a network under the control of the main control unit 1, and an external image according to a predetermined image data transmission protocol. This is an interface for sending and receiving e-mails and facsimiles to and from the forming apparatus.

  The main control unit 1 includes a CPU, a ROM that stores a startup program for the CPU, and the like. The image reading unit 3, the storage unit 5, the operation panel unit 7, the printing unit 9, and the application program stored in the storage unit 5 The computer includes a control computer that controls the communication unit 11.

  Based on the application program and setting information (not shown), the main control unit 1 stores the image data from the image reading unit 3 and the communication unit 11 in the storage unit 5, and passes the image data to the printing unit 9. It has a function of controlling printing (image formation control) and a function of controlling data communication with an external image forming apparatus.

  Next, the printing unit 9 described above will be described with reference to FIGS.

  The printing unit 9 includes a paper feeding stage 15 in which paper is set, a registration roller 17 that secondarily feeds the paper that has been primarily fed from the paper feeding stage 15 and conveyed at a predetermined interval, and a memory. 5, a rotating photosensitive member 21 on which a toner image is formed by the toner image forming unit 19 based on the image data read from the image data 5, a pressure roller 23 disposed in parallel with the rotating photosensitive member 21 so as to be in pressure contact therewith, and a rotating photosensitive member. For example, a monochrome print image forming unit having a fixing unit 25 positioned on the downstream side of the body 21 and the pressure roller 23, and a print control unit 27 for controlling the registration roller 17, the toner image forming unit 19, and the rotary photosensitive member 21. It is.

  Although not shown, the toner image forming unit 19 emits laser light from the laser light emitting element based on the image data, reflects the laser light by the rotating mirror, and scans and irradiates the rotating photosensitive member 21 through the lens L. Thus, a latent image is formed on the surface of the rotating photosensitive member 21, and a toner image is formed on the latent image by toner from the toner cassette.

  The toner image forming unit 19 uses the image data read from the document by the image reading unit 3 as main image data, and forms a main toner image on the surface of the rotary photoconductor 21 with a predetermined interval for each page. In the interval between pages of data or between pages, that is, in a portion slightly before the main toner image formation position for one page (blank portion), the employee number of the apparatus starter is used as auxiliary image data, and an auxiliary toner image is generated based on this. It has the function to form.

  Therefore, a main toner image based on the main image data and an auxiliary toner image based on the auxiliary image data are formed at a position prior to this on the surface of the rotating photoconductor 21.

  The registration roller 17 described above is configured so that the paper is conveyed between the rotary photosensitive member 21 and the pressure roller 23 in accordance with the timing at which the main toner image arrives at the pressure roller 23 portion, and the main toner image is transferred onto the paper. It functions as a paper conveyance control unit that performs secondary paper feeding control of paper.

  The print control unit 25 forms a main toner image on the rotating photoconductor 21 based on the main image data for each page, and an auxiliary toner image based on the auxiliary image data at a portion slightly before the main toner image formation position on the last page. The registration roller 17 controls the toner image forming unit 19 so as to form the image on the rotating photosensitive member 21 and conveys the paper at an interval at which the auxiliary toner image of the auxiliary toner image portion is directly transferred to the pressure roller 23. It has a function to control.

  In other words, during the period in which the auxiliary toner image is directly transferred to the pressure roller 23, conveyance control is performed so that the sheet is not conveyed between the rotating photosensitive member 21 and the pressure roller 23.

  As a result, the auxiliary toner image Za before the main toner image forming position is directly brought into contact with the pressure roller 23 and transferred to the pressure roller 23 in a state where the paper B does not arrive as shown in FIG. 3A. On the other hand, as shown in FIG. 7B, the main toner image Zb is transferred onto the sheet conveyed between the rotary photosensitive member 21 and the pressure roller 23.

  In addition, in general, when the diameters of the rotating photoconductor 21 and the pressure roller 23 are compared, the diameter of the pressure roller 23 is significantly shorter. Therefore, the auxiliary toner image Za is formed on the surface of the rotating photoconductor 21 on the main toner image Zb. If it is controlled so that the main toner image Zb is transferred to the paper B so that it can be transferred to the paper B. In the process of transferring the main toner image Zb to the paper B, the auxiliary toner image Zb is also transferred to the back surface of the paper B at a time.

  Next, the operation of the image forming apparatus according to the present invention will be described.

  The case where the main image data is a plurality of pages will be described as an example.

  The print control unit 25 controls the toner image forming unit 19 to form the main toner image Zb on the rotating photoreceptor 21 based on the main image data for each page as shown in FIG. 3A (main toner image forming process). Then, an auxiliary toner image Za based on the auxiliary image data is formed in advance on the rotating photoconductor 21 slightly before the main toner image forming position on the last page (auxiliary toner image forming process).

  Since the rotation photoconductor 21 is controlled to rotate, the auxiliary toner image Za moves to the pressure roller 23 portion before the main toner image Zb as the rotation photoconductor 21 rotates, but the paper B is not conveyed. The auxiliary toner image Za is directly transferred to the pressure roller 23 (auxiliary toner image transfer process).

  At the timing when the main toner image Zb moves to the pressure roller 23 portion as the rotary photoconductor 21 rotates, the paper B is conveyed between the rotary photoconductor 21 and the pressure roller 23, while the pressure roller 23 The auxiliary toner image Za moves to the vicinity of the rotary photoconductor 21, the main toner image Zb is transferred from the rotary photoconductor 21 to one side (front surface) of the paper B, and the auxiliary toner image Za of the pressure roller 23 is transferred to the paper. Transferred to the opposite surface (back surface) at once (paper transfer process).

  Thereafter, the toner image Za, Zb on the front and back surfaces of the paper B on which the main toner image Zb and the auxiliary toner image Za are transferred is heated and fixed by the fixing unit 25 and is discharged from the paper discharge unit.

  In FIG. 4A, an auxiliary toner image Za is formed in a blank portion between the main toner image based on the second image data and the main toner image Zb based on the third image data in a three-page document. FIG. 5B shows a state in which an auxiliary image such as an employee number is printed on the back surface of the third sheet B, which is the final page.

  These main processing steps correspond to the image forming method of the present invention.

  As described above, the image forming apparatus of the present invention forms the main toner image on the rotating photoreceptor 21 based on the main image data and forms the auxiliary toner image based on the auxiliary image data, and the rotation thereof. A pressure roller 23 that is arranged to apply pressure to the photoconductor 21 and transfers a toner image to a sheet conveyed between the rotating photoconductor and a registration roller that controls conveyance of the sheet at a predetermined interval for each sheet. A (paper conveyance control unit) 17 forms a main toner image on the rotating photoconductor on the basis of the main image data for each page, and based on the auxiliary image data slightly before the main toner image formation position on the final page. The toner image forming unit 19 is controlled so as to form an auxiliary toner image on the rotating photoconductor, and the resist is conveyed so that the auxiliary toner image is conveyed to the pressure roller 23 at intervals. A print control unit 27 for controlling the rollers 17, and a.

  Therefore, the toner image based on the auxiliary image data can be displayed as information on the back surface of the paper without reversing the paper, and the auxiliary toner image is formed before the last page of the main image data. Even if the image data is for a plurality of sheets, it is easy to check the toner image on the back side of the paper on the last page.

  However, the present invention is not limited to the configuration in which the auxiliary image data is formed in the portion before the main toner image forming position of the last page, and the auxiliary toner image is formed in the portion before the main toner image forming position for one page. If configured, it is easy to check the information on the back side of the sheet, regardless of whether the image data is for one sheet or a plurality of sheets. It can be considered that one sheet of image data (original) corresponds to the last page.

  Further, since the auxiliary toner image is formed based on the auxiliary image data for specifying the user of the apparatus, there is an advantage that it is easy to specify the user who starts the image forming apparatus.

  Further, since a monochromatic auxiliary toner image is formed based on the auxiliary image data, it can be implemented in any one of magenta, yellow, cyan, and black, not only in monochrome image formation but also in color image formation, and is monochromatic. The configuration is simplified.

  By the way, in the image forming apparatus of the present invention, as shown in FIG. 3, the cleaning unit 29 that removes the trace of the auxiliary toner image Za on the paper B moves forward and backward with respect to the pressure roller 23. If the arrangement is possible, even if the auxiliary toner image Za transferred to the pressure roller 29 and transferred to the paper B remains on the pressure roller 23, the trace can be removed and based on the auxiliary image data Za. It is difficult to display the same auxiliary toner image over a plurality of sheets B, and the quality of the printed sheet can be maintained and improved.

  In the image forming apparatus of the present invention, the main image data described above is arbitrary as long as it is original data for forming a print image on one side of the paper B, and the auxiliary image data transferred to the back side of the paper is also an employee. The data is not limited to a number, and may be a department name to which an employee belongs, a company name, a logo, or any other data that does not interfere with main image data even if there is no auxiliary image data.

  The image forming method according to the present invention can provide the same effects as those of the image forming apparatus of the present invention.

DESCRIPTION OF SYMBOLS 1 Main control part 3 Image reading part 5 Memory | storage part 7 Operation panel part 9 Printing part 11 Communication part 13 Main body case 15 Paper feed stage 17 Registration roller (paper conveyance control part)
19 Toner image forming unit 21 Rotating photosensitive member 23 Pressure roller 25 Fixing unit 27 Print control unit 29 Cleaning unit Za Auxiliary toner image Zb Main toner image A Image forming apparatus B Paper

Claims (6)

A rotating photoreceptor;
A toner image forming unit that forms a main toner image on the rotating photoreceptor based on main image data and forms an auxiliary toner image based on auxiliary image data that identifies a user of the apparatus;
Wherein arranged rotatable photosensitive member has a significantly shorter diameter than the rotating photoreceptor pressurizing manner, the causes are transferring the main toner image to one side of the sheet conveyed between the rotating photosensitive member A pressure roller for transferring the auxiliary toner image to the opposite surface of the paper ;
A sheet conveyance control unit for controlling conveyance of the main toner image between the rotating photosensitive member and the pressure roller at a predetermined interval for each sheet in order to transfer the main toner image on one side;
The main toner image is formed on the rotating photoconductor for each page, and the front portion of the final page of the main image data has a dimension slightly shorter than the circumferential dimension of the pressure roller from the main toner image formation position. The toner image forming unit is controlled to form an auxiliary toner image on the rotating photoconductor, and the auxiliary toner image is directly transferred to the pressure roller prior to the main toner image on the last page of the main image data. The paper transport control unit transports the paper at an interval at which the main toner image from the rotating photoconductor and the auxiliary toner image from the pressure roller are transferred to the front and back surfaces of the paper at a time. An image forming apparatus comprising: a print control unit that controls the image forming apparatus.   The image forming apparatus according to claim 1, wherein the print control unit controls the toner image forming unit to form the single color auxiliary toner image based on the auxiliary image data.   The image forming apparatus according to claim 1, wherein the pressure roller includes a cleaning unit that removes traces of the auxiliary toner image transferred to the sheet. A main toner image forming process for forming a main toner image on the rotating photoconductor based on main image data for each page;
The auxiliary toner image based on the auxiliary image data for identifying the user of the apparatus is rotated on the front part of the last page of the main image data slightly shorter than the circumferential dimension of the pressure roller from the main toner image forming position on the last page. An auxiliary toner image forming process to be formed on the photoreceptor;
The rotation of the photosensitive member the pressure roller the arranged to compress the rotating photosensitive member has a substantially shorter diameter than the diameter of the auxiliary toner image transferred directly the auxiliary toner image prior to the main toner image Transcription process,
Transferring the main toner image from the rotating photoconductor for single-sided printing onto one side of the sheet conveyed between the rotating photoconductor and the pressure roller, and at the last page of the main image data, A paper transfer process for transferring the main toner image from the rotating photoconductor and the auxiliary toner image from the pressure roller to the opposite surface of the paper at a time;
An image forming method comprising:   The image forming method according to claim 4, wherein the auxiliary toner image forming process forms the auxiliary toner image of a single color based on the auxiliary image data. 6. The image forming method according to claim 4, further comprising a cleaning process for removing traces of the auxiliary toner image transferred to the paper in the pressure roller.

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